linux-kernel - Re: Hang on large copy_from_user with PREEMPT

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Message-ID: <20150407103955.GB14095@pd.tnic>
Date:	Tue, 7 Apr 2015 12:39:55 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Dave Jones <davej@...hat.com>, Michal Hocko <mhocko@...e.cz>,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Re: Hang on large copy_from_user with PREEMPT_NONE

On Tue, Apr 07, 2015 at 11:31:45AM +0200, Ingo Molnar wrote:
> Would be nice to see the actual kernel .config, as there's a few
> debug features that can slow things down significantly, such as
> CONFIG_KMEMCHECK=y or in some cases CONFIG_DEBUG_PAGEALLOC=y.

He sent it here: https://lkml.kernel.org/r/55229D7E.6080309@oracle.com

I'm attaching it again.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
--

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